Grade Liner

Details Grade Liner Grade Liner

1980-07-22

1982-12-21

Martin, Jr., William D.

Geometrical instruments

Miscellaneous

Light direction

33 1LE, 33292, 33353, 33399, G01B 1100

Patent

active

043641750

ABSTRACT:
A grade liner which is used in cooperation with grade stakes to determine the grade within a ditch. Means are provided for establishing a horizontal line of sight a selected rise distance "A" above a grade stake. Plumb means are provided which intersect the established horizontal sight line a given offset distance from said stake. The plumb means is calibrated such that the zero calibration is located a selected distance related to said rise distance "A" from the lower end of said plumb means. In a preferred embodiment of the invention, optical means, such as a target sighting rifle scope, are utilized in establishing a desired horizontal sight line. For the plumb means, a surveyor's tape measure may be utilized when coupled to a plumb bob, the length of which bob is selectively determinable and related to the distance said sight line lies above the grade stake.

REFERENCES:
patent: 383767 (1888-05-01), Reichenbach
patent: 414232 (1889-11-01), Lowe
patent: 2096638 (1937-10-01), Higgins, Jr.
patent: 2753633 (1956-07-01), Calver
patent: 2762128 (1956-09-01), Whelan
patent: 2863219 (1958-12-01), Whelan
patent: 2873529 (1959-02-01), Hogan et al.
patent: 2879598 (1959-03-01), Noble
patent: 4274203 (1981-06-01), Vasile

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